a = 21
b = 10
c = 0
if (a == b):
    print('(1)a等于b')
else:
    print('(1)a不等于b')
if (a != b):
    print('(2)a不等于b')
else:
    print('(2)a等于b')
if (a < b):
    print('(3)a小于b')
else:
    print('(3)a大于等于b')
if (a > b):
    print('(4)a大于b')
else:
    print('(4)a小于等于b')
